Air Compressors...
 

Harry Krause writes:

CFM/PSI 3.6@100 3.8@100 4.5@100

The flow through a Schrader valve at these pressures is well below any of
those CFM delivery rates. So they will *all* fill a tire in about the same
time, since they will all maintain the same delivery pressure (that is,
cycle on and off to keep up with the air being drained), within the
hysteresis of the tank pressure, and assuming there is a storage tank.

A smaller compressor is only slower than a larger one if the smaller falls
behind the volume demand. From the point of view of the tire, all you see
is the pressure, not the CFM capacity.

Compressed air is commonly misunderstood. See my essay:

http://www.truetex.com/aircompressors.htm